Chemistry / Unit 11 Chem 2203 short lesson, about 20 seconds
Concentration Cells
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The idea
A concentration cell generates a potential from a concentration difference; the same half-reaction at both electrodes makes E°cell zero, so Ecell comes entirely from Q.
In practice
Two silver electrodes in silver nitrate solutions of different concentrations generate a small potential.
Where people slip
Looking up the electrode's tabulated reduction potential and reporting it as the cell potential ignores that Ecell comes entirely from Q.
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